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Ok, noted! Thanks for your reply!

Hi, Please refer attached cross sectional view for this pilot operated valve at Dipper_Valve_China. These are pilot operated surge relief valve. Hope now you have required information for brand & type of valve...

Hi, This is pilot operated axial flow type surge relief valve. Customer requirement for design & testing as per ISO 4126. So applicable standard is "ISO 4126-4:2013 - Safety devices for protection against excessive pressure — Part 4: Pilot operated safety valves". After our discussion, I came...

Hi, Thanks for your reply, it is very useful information! I would like to ask one more query regarding form of any valve body; to be tested under hydro-shell. If any valve body made from bar machining or forging; then also specification ask for hydro shell for it (as it is main valve body OR...

Hello All, For pilot operated surge relief valve, hydrostatic shell testing; does any standard specification asks for pilot testing at same pressure as main valve body shell test? For example, if we have CL.300 pressure class valve; we will do hydro shell at 78 bar (1.5 times of rated...